From: Anastasia Belova abelova@astralinux.ru

commit 5958d35917e1296f46dfc8b8c959732efd6d8d5d upstream.

nid may be equal to NUMA_NO_NODE=-1. Prevent accessing node_data array by invalid index with check for nid.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: e83a437faa62 ("mm/memory_hotplug: introduce "auto-movable" online policy") Signed-off-by: Anastasia Belova abelova@astralinux.ru Acked-by: David Hildenbrand david@redhat.com Acked-by: Oscar Salvador osalvador@suse.de Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Mikhail Lobanov m.lobanov@rosalinux.ru --- mm/memory_hotplug.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index dc17618bad8b..90f0cc9a298a 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -783,7 +783,6 @@ static bool auto_movable_can_online_movable(int nid, struct memory_group *group, unsigned long kernel_early_pages, movable_pages; struct auto_movable_group_stats group_stats = {}; struct auto_movable_stats stats = {}; - pg_data_t *pgdat = NODE_DATA(nid); struct zone *zone; int i;

@@ -794,6 +793,8 @@ static bool auto_movable_can_online_movable(int nid, struct memory_group *group, auto_movable_stats_account_zone(&stats, zone); } else { for (i = 0; i < MAX_NR_ZONES; i++) { + pg_data_t *pgdat = NODE_DATA(nid); + zone = pgdat->node_zones + i; if (populated_zone(zone)) auto_movable_stats_account_zone(&stats, zone);